Integrate SonarCloud

Signed-off-by: Ry Jones <ry@linux.com>

.github/workflows/sonar.yml

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+name: Sonar Cloud
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    types: [opened, synchronize, reopened]
+jobs:
+  sonarcloud:
+    name: SonarCloud
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          fetch-depth: 0  # Shallow clones should be disabled for a better relevancy of analysis
+      - name: SonarCloud Scan
+        uses: SonarSource/sonarcloud-github-action@master
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}  # Needed to get PR information, if any
+          SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}

sonar-project.properties

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+#
+#    SPDX-License-Identifier: Apache-2.0
+#
+
+sonar.projectKey=hyperledger-labs_blockchain-explorer
+sonar.organization=hyperledger-labs
+
+# Path to sources
+sonar.sources=.
+sonar.exclusions=**/e2e-test/**,**/test/**,docs/**/*,devenv/**/*,client/**/*.spec.js
+#sonar.inclusions=
+
+# Path to tests
+#sonar.tests=
+#sonar.test.exclusions=
+#sonar.test.inclusions=
+
+# Source encoding
+#sonar.sourceEncoding=UTF-8
+
+# Exclusions for copy-paste detection
+#sonar.cpd.exclusions=
+
+# This is the name and version displayed in the SonarCloud UI.
+#sonar.projectName=blockchain-explorer
+#sonar.projectVersion=1.0